161. There are fourteen atoms in a unit cell of
body centred cubic space lattice
face centred cubic space lattice
close packed hexagonal space lattice
none of these
✅ The correct answer is option B.
Engineering Materials MCQs
162. The maximum solubility of carbon in austenite is 1.7% at 1130° C.
Yes
No
✅ The correct answer is option A.
163. The heat treatment process used for castings is
carburising
normalising
annealing
tempering
✅ The correct answer is option B.
164. Bronze is an alloy of
copper and zinc
copper and tin
copper, tin and zinc
none of these
✅ The correct answer is option B.
165. Thermosetting plastics are those materials which
are formed into shape under heat and pressure and results in a permanently hard product
do not become hard with the application of heat and pressure and no chemical change occurs
are flexible and can withstand considerable wear under suitable conditions
are used as a friction
✅ The correct answer is option A.
166. The material in which the atoms are arranged chaotically, is called
amorphous material
mesomorphous material
crystalline material
none of these
✅ The correct answer is option A.
167. For a steel containing 0.8% carbon
there is no critical point
there is only one critical point
there are two critical points
there can be any numbe
✅ The correct answer is option B.
168. The portion of the blast furnace below its widest cross-section is called
hearth
stack
bosh
throat
✅ The correct answer is option C.
169. When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.
equal to
less than
more than
✅ The correct answer is option B.
170. Induction hardening is basically a
carburising process
surface hardening process
core-hardening process
none of these
✅ The correct answer is option B.